def test_child_spy_caching(
decoy: Decoy,
call_handler: CallHandler,
spy_creator: SpyCreator,
) -> None:
"""It should create a child spy only once."""
parent_spec = decoy.mock(cls=Spec)
child_spec = decoy.mock(cls=Spec)
child_spy = decoy.mock(cls=Spy)
wrong_spy = decoy.mock(cls=Spy)
decoy.when(parent_spec.get_child_spec("child")).then_return(child_spec)
decoy.when(spy_creator.create(spec=child_spec,
is_async=False)).then_return(
child_spy,
wrong_spy,
)
subject = Spy(
spec=parent_spec,
call_handler=call_handler,
spy_creator=spy_creator,
)
assert subject.child is child_spy
assert subject.child is child_spy
def test_decoy_creates_specless_spy(decoy: Decoy) -> None:
"""It should be able to create a spec-less spy."""
subject = decoy.mock()
assert isinstance(subject, Spy)
# test deprecated create_decoy_func method
subject = decoy.create_decoy_func()
assert isinstance(subject, Spy)
# test naming the spy
subject = decoy.mock(name="spy_name")
assert repr(subject) == "<Decoy mock `spy_name`>"
async def test_async_context_manager_mock(decoy: Decoy) -> None:
"""It should be able to mock an async context manager."""
class _ValueReader(ContextManager[Any]):
async def __aenter__(self) -> "_ValueReader":
...
async def __aexit__(self, *args: Any) -> None:
...
def get_value(self) -> int:
...
value_reader = decoy.mock(cls=_ValueReader)
def _handle_enter() -> _ValueReader:
decoy.when(value_reader.get_value()).then_return(42)
return value_reader
def _handle_exit(*args: Any) -> None:
decoy.when(value_reader.get_value()).then_raise(
AssertionError("Context manager exited"))
decoy.when(await value_reader.__aenter__()).then_do(_handle_enter)
decoy.when(await value_reader.__aexit__(None, None,
None)).then_do(_handle_exit)
async with value_reader as subject:
result = subject.get_value()
assert result == 42
with pytest.raises(AssertionError, match="exited"):
subject.get_value()
def test_property_getter_stub_then_raise(decoy: Decoy) -> None:
"""It should be able to stub a property getter to raise."""
subject = decoy.mock()
decoy.when(subject.prop_name).then_raise(ValueError("oh no"))
with pytest.raises(ValueError, match="oh no"):
subject.prop_name
def test_property_getter_stub_then_return_multiple(decoy: Decoy) -> None:
"""It should be able to stub a property getter with multiple return values."""
subject = decoy.mock()
decoy.when(subject.prop_name).then_return(43, 44)
assert subject.prop_name == 43
assert subject.prop_name == 44
assert subject.prop_name == 44
def test_decoy_creates_specless_async_spy(decoy: Decoy) -> None:
"""It should be able to create an async specless spy."""
subject = decoy.mock(is_async=True)
assert isinstance(subject, AsyncSpy)
# test deprecated create_decoy_func method
subject = decoy.create_decoy_func(is_async=True)
assert isinstance(subject, AsyncSpy)
def test_when_then_raise(decoy: Decoy) -> None:
"""It should be able to configure a stub raise with a rehearsal."""
subject = decoy.mock(func=some_func)
decoy.when(subject("goodbye")).then_raise(ValueError("oh no"))
with pytest.raises(ValueError, match="oh no"):
subject("goodbye")
def test_property_getter_stub_then_do(decoy: Decoy) -> None:
"""It should be able to stub a property getter to act."""
def _handle_get(*args: Any, **kwargs: Any) -> int:
return 84
subject = decoy.mock()
decoy.when(subject.prop_name).then_do(_handle_get)
assert subject.prop_name == 84
def test_property_deleter_stub_then_rase(decoy: Decoy) -> None:
"""It should be able to stub a property deleter to raise."""
subject = decoy.mock()
prop_rehearser = decoy.prop(subject.prop_name)
decoy.when(prop_rehearser.delete()).then_raise(ValueError("oh no"))
with pytest.raises(ValueError, match="oh no"):
del subject.prop_name
def test_reset(decoy: Decoy) -> None:
"""It should be able to reset its state."""
subject = decoy.mock(cls=SomeClass)
subject.foo("hello")
decoy.reset()
with pytest.raises(AssertionError):
decoy.verify(subject.foo("hello"))
def test_property_getter_stub_reconfigure(decoy: Decoy) -> None:
"""It should be able to reconfigure a property getter."""
subject = decoy.mock()
decoy.when(subject.prop_name).then_return(42)
assert subject.prop_name == 42
decoy.when(subject.prop_name).then_return(43)
assert subject.prop_name == 43
def test_decoy_creates_func_spy(decoy: Decoy) -> None:
"""It should be able to create a Spy from a function."""
subject = decoy.mock(func=some_func)
assert isinstance(subject, Spy)
# test deprecated create_decoy_func method
subject = decoy.create_decoy_func(spec=some_func)
assert isinstance(subject, Spy)
async def test_verify_async(decoy: Decoy) -> None:
"""It should be able to configure a verification with an async rehearsal."""
subject = decoy.mock(cls=SomeAsyncClass)
await subject.foo("hello")
decoy.verify(await subject.foo("hello"))
with pytest.raises(AssertionError):
decoy.verify(await subject.foo("goodbye"))
def test_create_async_spy(decoy: Decoy, call_handler: CallHandler) -> None:
"""It should get default configurations from the spec."""
spec = decoy.mock(cls=Spec)
decoy.when(spec.get_is_async()).then_return(True)
subject = SpyCreator(call_handler=call_handler)
result = subject.create(spec=spec)
assert isinstance(result, AsyncSpy)
def test_verify(decoy: Decoy) -> None:
"""It should be able to configure a verification with a rehearsal."""
subject = decoy.mock(func=some_func)
subject("hello")
decoy.verify(subject("hello"))
decoy.verify(subject(val="hello"))
with pytest.raises(errors.VerifyError):
decoy.verify(subject("goodbye"))
async def test_when_async(decoy: Decoy) -> None:
"""It should be able to stub an async method."""
subject = decoy.mock(cls=SomeAsyncClass)
decoy.when(await subject.foo("hello")).then_return("world")
decoy.when(await subject.bar(0, 1.0, "2")).then_raise(ValueError("oh no"))
assert await subject.foo("hello") == "world"
with pytest.raises(ValueError, match="oh no"):
await subject.bar(0, 1.0, "2")
def test_when_ignore_extra_args(decoy: Decoy) -> None:
"""It should be able to ignore extra args in a stub rehearsal."""
def _get_a_thing(id: str, default: Optional[int] = None) -> int:
raise NotImplementedError("intentionally unimplemented")
subject = decoy.mock(func=_get_a_thing)
decoy.when(subject("some-id"), ignore_extra_args=True).then_return(42)
result = subject("some-id", 101)
assert result == 42
def test_decoy_creates_spy(decoy: Decoy) -> None:
"""It should be able to create a Spy from a class."""
subject = decoy.mock(cls=SomeClass)
assert isinstance(subject, SomeClass)
assert isinstance(subject, Spy)
# test deprecated create_decoy method
subject = decoy.create_decoy(spec=SomeClass)
assert isinstance(subject, SomeClass)
assert isinstance(subject, Spy)
class DecoyTestCase(unittest.TestCase):
"""Decoy test case using unittest."""
def setUp(self) -> None:
"""Set up before each test."""
self.decoy = Decoy()
def tearDown(self) -> None:
"""Clean up after each test."""
self.decoy.reset()
def test_when(self) -> None:
"""Test that self.decoy.when works."""
mock = self.decoy.mock(cls=SomeClass)
self.decoy.when(mock.foo("hello")).then_return("world")
assert mock.foo("hello") == "world"
def test_verify(self) -> None:
"""Test that self.decoy.verify works."""
mock = self.decoy.mock(cls=SomeClass)
mock.foo("hello")
self.decoy.verify(mock.foo("hello"))
def test_verify_call_list(decoy: Decoy) -> None:
"""It should be able to verify multiple calls."""
subject_1 = decoy.mock(cls=SomeClass)
subject_2 = decoy.mock(cls=SomeNestedClass)
subject_1.foo("hello")
subject_2.child.bar(1, 2.0, "3")
subject_1.foo("goodbye")
decoy.verify(
subject_1.foo("hello"),
subject_2.child.bar(1, 2.0, "3"),
subject_1.foo("goodbye"),
)
with pytest.raises(errors.VerifyError):
decoy.verify(
subject_1.foo("hello"),
subject_1.foo("goodbye"),
subject_2.child.bar(1, 2.0, "3"),
)
def test_property_setter_stub_then_raise(decoy: Decoy) -> None:
"""It should be able to stub a property setter to raise."""
subject = decoy.mock()
prop_rehearser = decoy.prop(subject.prop_name)
decoy.when(prop_rehearser.set(42)).then_raise(ValueError("oh no"))
subject.prop_name = 41
assert subject.prop_name == 41
with pytest.raises(ValueError, match="oh no"):
subject.prop_name = 42
def test_child_spy(
decoy: Decoy,
call_handler: CallHandler,
spy_creator: SpyCreator,
) -> None:
"""It should create a child spy."""
parent_spec = decoy.mock(cls=Spec)
child_spec = decoy.mock(cls=Spec)
child_spy = decoy.mock(cls=Spy)
decoy.when(parent_spec.get_child_spec("child")).then_return(child_spec)
decoy.when(spy_creator.create(spec=child_spec,
is_async=False)).then_return(child_spy)
subject = Spy(
spec=parent_spec,
call_handler=call_handler,
spy_creator=spy_creator,
)
result = subject.child
assert result is child_spy
def test_generator_context_manager_mock(decoy: Decoy) -> None:
"""It should be able to mock a generator-based context manager."""
class _ValueReader:
def get_value(self) -> int:
...
class _ValueReaderLoader:
@contextlib.contextmanager
def get_value_reader(self) -> Iterator[_ValueReader]:
...
value_reader_loader = decoy.mock(cls=_ValueReaderLoader)
value_reader = decoy.mock(cls=_ValueReader)
decoy.when(
value_reader_loader.get_value_reader()).then_enter_with(value_reader)
decoy.when(value_reader.get_value()).then_return(42)
with value_reader_loader.get_value_reader() as subject:
result = subject.get_value()
assert result == 42
def test_verify_times(decoy: Decoy) -> None:
"""It should be able to verify a call count."""
subject = decoy.mock(func=some_func)
subject("hello")
decoy.verify(subject("hello"), times=1)
decoy.verify(subject("goodbye"), times=0)
with pytest.raises(errors.VerifyError):
decoy.verify(subject("hello"), times=0)
with pytest.raises(errors.VerifyError):
decoy.verify(subject("hello"), times=2)
def test_when_then_return(decoy: Decoy) -> None:
"""It should be able to configure a stub return with a rehearsal."""
subject = decoy.mock(func=some_func)
decoy.when(subject("hello")).then_return("hello world")
result = subject(val="hello")
assert result == "hello world"
result = subject(val="hello")
assert result == "hello world"
result = subject("asdfghjkl")
assert result is None
async def test_async_generator_context_manager_mock(decoy: Decoy) -> None:
"""It should be able to mock a generator-based context manager."""
class _ValueReader:
def get_value(self) -> int:
...
class _ValueReaderLoader:
@contextlib.asynccontextmanager
async def get_value_reader(self) -> AsyncIterator[_ValueReader]:
raise NotImplementedError()
yield
value_reader_loader = decoy.mock(cls=_ValueReaderLoader)
value_reader = decoy.mock(cls=_ValueReader)
decoy.when(
value_reader_loader.get_value_reader()).then_enter_with(value_reader)
decoy.when(value_reader.get_value()).then_return(42)
async with value_reader_loader.get_value_reader() as subject:
result = subject.get_value()
assert result == 42
async def test_spy_async_context_manager(
decoy: Decoy,
call_handler: CallHandler,
spy_creator: SpyCreator,
spec: Spec,
) -> None:
"""It should be usable in an `async with` statement."""
enter_spec = decoy.mock(cls=Spec)
exit_spec = decoy.mock(cls=Spec)
enter_spy = decoy.mock(cls=AsyncSpy)
exit_spy = decoy.mock(cls=AsyncSpy)
error = RuntimeError("oh no")
decoy.when(spec.get_name()).then_return("spy_name")
decoy.when(spec.get_child_spec("__aenter__")).then_return(enter_spec)
decoy.when(spec.get_child_spec("__aexit__")).then_return(exit_spec)
decoy.when(spy_creator.create(spec=enter_spec,
is_async=True)).then_return(enter_spy)
decoy.when(spy_creator.create(spec=exit_spec,
is_async=True)).then_return(exit_spy)
decoy.when(await enter_spy()).then_return(42)
subject = Spy(spec=spec,
call_handler=call_handler,
spy_creator=spy_creator)
tb = None
try:
async with subject as result:
assert result == 42
raise error
except RuntimeError:
tb = sys.exc_info()[2]
pass
decoy.verify(await exit_spy(RuntimeError, error, tb))
def test_mock_with_name(
decoy: Decoy,
spy_creator: SpyCreator,
call_handler: CallHandler,
subject: DecoyCore,
) -> None:
"""It should create a generic spy by default."""
spy = decoy.mock(cls=Spy)
decoy.when(spy_creator.create(spec=None, name="my-spy",
is_async=False)).then_return(spy)
result = subject.mock(name="my-spy")
assert result is spy
def test_when_then_do(decoy: Decoy) -> None:
"""It should be able to configure a stub action with a rehearsal."""
subject = decoy.mock(func=some_func)
action_result = None
def _then_do_action(arg: str) -> str:
nonlocal action_result
action_result = arg
return "hello from the other side"
decoy.when(subject("what's up")).then_do(_then_do_action)
result = subject("what's up")
assert action_result == "what's up"
assert result == "hello from the other side"
def test_create_spy(decoy: Decoy, call_handler: CallHandler) -> None:
"""It should get default configurations from the spec."""
spec = decoy.mock(cls=Spec)
sig = inspect.signature(some_func)
decoy.when(spec.get_full_name()).then_return("hello.world")
decoy.when(spec.get_signature()).then_return(sig)
decoy.when(spec.get_class_type()).then_return(SomeClass)
subject = SpyCreator(call_handler=call_handler)
result = subject.create(spec=spec, name="foo")
assert isinstance(result, Spy)
assert isinstance(result, SomeClass)
assert inspect.signature(result) == sig
assert repr(result) == "<Decoy mock `hello.world`>"